/*
 * Copyright 2019 Immutables Authors and Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.immutables.criteria.geode;

import org.apache.geode.cache.Cache;
import org.apache.geode.cache.Scope;
import org.immutables.criteria.backend.ContainerNaming;

import java.util.function.Consumer;

class AutocreateRegion implements Consumer<Class<?>> {

  private final Cache cache;
  private final ContainerNaming naming;

  AutocreateRegion(Cache cache) {
    this(cache, ContainerNaming.DEFAULT);
  }

  AutocreateRegion(Cache cache, ContainerNaming containerNaming) {
    this.cache = cache;
    this.naming = containerNaming;
  }

  @Override
  public void accept(Class<?> entity) {
    String name = naming.name(entity);
    // exists ?
    if (cache.getRegion(name) != null) {
      return;
    }

    @SuppressWarnings("unchecked")
    Class<Object> valueConstraint = (Class<Object>) entity;
    // if not, create
    cache.createRegionFactory()
            .setScope(Scope.LOCAL) // otherwise ConcurrentMap API doesn't work for Region
            .setValueConstraint(valueConstraint)
            .create(name);
  }
}
